Anyway, this REALLY familiar song came up after the first boss encounter, after a minute, it came to me -- Suikoden 2. Googling revealed this link:
http://www.nicovideo.jp/watch/sm17056946
The guy who posted the video contacted 5pb on why the song was so similar to the song in Suikoden 2. 5bp's response:
---Regarding your inquiry, we consulted the matter with the development staff for "Beyond the Future - Fix the Time Arrows". Being big fans of Suikoden 2, and the "Reminiscence" song in particular, they felt that there were many rpg elements similar to Suikoden 2 in this game and -- despite the genre of this game being different(visual novel targeted at female audience) -- wanted to use this opportunity to pay homage. We hope this answers your question and look forward to your continued interest in 5pb products.
Comments on the niconico video are among the following:
WTF! You call this a homage? This is a ripoff!
KONAMI, sue them!
Boycotting 5pb. You guys are the worst!
Suikoden fans would recognize this in a second. Why'd they use this?
Unforgivable!
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If this visual novel was a huge hit, like Stein's Gate, who know, maybe Konami might have sued? (Maybe they can still sue and use that money to make Suikoden 6...) Or another possibility is that the some members of each team know each other (maybe drinking buddies, a big thing in Japan) and talked about this beforehand.
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And here's a review in English of the PSP LE version of the game complaining about the same issue:
http://www.amazon.co.jp/review/RSDKKLIDNSOHB